> Clearly the US is exempt from the war crimes laws, and that needs to change. But it would require leaders of other major powers/countries to push for this
I don't see this happening any time soon, without a popular movement that drastically alters the American political landscape. Whichever party a president and legislators are from, they have war criminals among their ranks, so they couldn't accept their friends, colleagues, "bosses", etc. being sued and going to jail for war crimes. Not to mention the American fetishisation of the military, a politician could hardly campaign on sending "our heroes" on trial. Heck, Trump pardoned a notorious war criminal and it was celebrated by some.
So, baring a switch to proportional representation which would allow more parties and variety, or a popular movement that swipes away the current two parties, i absolutely can't imagine that happening.